Abstract
Macroreticular chelating resins containing aminomethylphosphonic acid groups were prepared by reaction of methyl methacrylate/divinylbenzene copolymer beads with triethylenetetramine, followed by the reaction of the products with phosphorous acid and formaline. The adsorption capacities of this resin for Cu2+, Pb2+, Zn2+, Ni2+, Co2+, Ca2+, and Mg2+ were determined at various pH values. The order of chelate stability for the resin was Cu2+ > Pb2+ > Zn2+ > Ni2+ > Co2+ > Ca2+ > Mg2+. Copper, nickel, zinc, calcium, and magnesium ions can be eluted with 1 mol dm−3 hydrochloric acid. The proposed resin appears to be useful for the removal of Ca2+ and Mg2+ from salt solution.
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